#set( $symbol_pound = '#' )
#set( $symbol_dollar = '$' )
#set( $symbol_escape = '\' )
package ${package}.common.utils;


import lombok.extern.slf4j.Slf4j;

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;

/**
 * Description: 压缩文件工具类
 *
 * @author songcx
 * @date 2020/4/2 10:21
 *
 * <pre>
 *              ${copyright}
 *      Copyright (c) 2019. All Rights Reserved.
 * </pre>
 */
@Slf4j
public class ZipFileUtils {

	private static final int BUFFER_SIZE = 2 * 1024;

	/**
	 * Description:压缩文件方法
	 * <>
	 *
	 * @param inputStream     1
	 * @param zipOutputStream 2
	 * @param fileName        3
	 * @author songcx
	 * @date 15:18 2020/4/3
	 **/
	public static void compressFile(InputStream inputStream, ZipOutputStream zipOutputStream, String fileName) throws IOException {
		try (BufferedInputStream bis = new BufferedInputStream(inputStream)) {
			ZipEntry entry = new ZipEntry(fileName);
			zipOutputStream.putNextEntry(entry);
			byte[] buf = new byte[10240];
			int size;
			while ((size = bis.read(buf)) != -1) {
				zipOutputStream.write(buf, 0, size);
			}
		} catch (Exception e) {
			log.error(e.getMessage());
		} finally {
			zipOutputStream.closeEntry();
			inputStream.close();
		}
	}

	public static void toZip(String srcDir, OutputStream out, boolean KeepDirStructure) throws RuntimeException {
		try (ZipOutputStream zos = new ZipOutputStream(out)){
			File sourceFile = new File(srcDir);
			compress(sourceFile, zos, sourceFile.getName(), KeepDirStructure);
		} catch (Exception e) {
			throw new RuntimeException("zip error from ZipUtils", e);
		}
	}

	private static void compress(File sourceFile, ZipOutputStream zos, String name, boolean KeepDirStructure) throws Exception{

		byte[] buf = new byte[BUFFER_SIZE];
		if (sourceFile.isFile()) {
			// 向zip输出流中添加一个zip实体，构造器中name为zip实体的文件的名字
			zos.putNextEntry(new ZipEntry(name));
			// copy文件到zip输出流中
			int len;
			FileInputStream in = null;
			try {
				in = new FileInputStream(sourceFile);
				while ((len = in.read(buf)) != -1) {
					zos.write(buf, 0, len);
				}
			} catch (FileNotFoundException e) {
				log.error("error info ",e);

			}finally {
				// Complete the entry
				zos.closeEntry();
				in.close();
			}
		} else {
			File[] listFiles = sourceFile.listFiles();
			if (listFiles == null || listFiles.length == 0) {
				// 需要保留原来的文件结构时,需要对空文件夹进行处理
				if (KeepDirStructure) {
					// 空文件夹的处理
					zos.putNextEntry(new ZipEntry(name + "/"));
					// 没有文件，不需要文件的copy
					zos.closeEntry();
				}

			} else {
				for (File file : listFiles) {
					// 判断是否需要保留原来的文件结构
					if (KeepDirStructure) {
						// 注意：file.getName()前面需要带上父文件夹的名字加一斜杠,
						// 不然最后压缩包中就不能保留原来的文件结构,即：所有文件都跑到压缩包根目录下了
						compress(file, zos, name + "/" + file.getName(), KeepDirStructure);
					} else {
						compress(file, zos, file.getName(), KeepDirStructure);
					}
				}
			}
		}
	}


}
